create: periodicheskaya-sistema.html, periody.html, svyaz-so-svoystvami-elementov.html, him-svoystva.html, atom.html, elektrony.html, yadro.html, style.css, index.html, fiz-svoystva.html, README.md, zadacha.html

create: index.html

create: index.html

create: index.html

create: index.html

create: Атом.html

create: index.html

create: index.html

create: Атом.html